\relax 
\@writefile{toc}{\contentsline {section}{\numberline {1}已知 $P(A)=\genfrac  {}{}{}0{1}{4}, P(B | A)=\genfrac  {}{}{}0{1}{3}, P(A | B)=\genfrac  {}{}{}0{1}{2}$, 求: $P(B), P(A \cup B)$ 和 $P(A \bar  {B})$.}{1}\protected@file@percent }
\@writefile{toc}{\contentsline {section}{\numberline {2}掷一颗骰子两次, 以 $x$ 和 $y$ 分别表示先后掷出的点数, 记 $A=\{x+y<10\}$, $B=\{x>y\}$, 求: $P(B | A)$ 和 $P(A | B)$.}{1}\protected@file@percent }
